High strength and high membrane polyvinyl alcohol fiber is a product that can control the plastic crack of concrete. The product is added to mortar or concrete to restrain the plastic shrinkage cracks of cement mortar and concrete before curing and increase the toughness of concrete. PVA fiber has superior mechanical and physical properties and high affinity with cement. Due to its unique molecular structure, PVA fiber has good adhesion to brittle material cement and plays a reinforcing role. Moreover, it has good alkali resistance and weather resistance, good light resistance and corrosion resistance, green environmental protection and no pollution.